SSDD
Gold Member
- Nov 6, 2012
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Give me a laser that outputs at 15 microns and I will show you how IR can heat CO2, which would then pass energy to the rest of the molecules by collision and raise the temperature of the air.
If we are talking about passing energy via conduction, then we aren't talking about a radiative greenhouse effect, are we? In your example, the air is being warmed via conduction, not IR.
The total energy of the atmosphere is increased by GHGs absorbing radiation energy. The energy of the atmosphere is constantly changing form through molecular collision. When it is in kinetic form, that is measured as temperature, and it is indicative of the total energy but not perfectly so.
Only by the absorption of IR by water vapor..and then not all energy absorbed by water vapor is retained by the vapor...most of that moves on via conduction by collision. Radiation plays such a small part in the temperature of the atmosphere that it is vanishingly insignificant....